Gas-fired heater



FIG. 1 is a front and right side perspective view of a gas-fired heater showing our new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a left side elevational thereof;

FIG. 4 is a right side elevational view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for a gas fired heater, as shown and described. 